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Comment on the Dispersion Relations used to Calculate Δρ
(American Physical Soc, 1995-06-01)
We use the operator product expansion (OPE) to show that nonperturbative QCD corrections to Δρ can be calculated using unsubtracted dispersion relations for either the transverse or the longitudinal vacuum polarization ...
Choice of dispersion relation to calculate the QCD correction to Gamma(H->l(+)l(-))
(American Physical Soc, 1996-02-01)
We use the Operator Product Expansion (OPE) of quark vacuum polarization functions to show that the dispersion relation of Kniehl and Sirlin will yield the correct result to all orders in αs when applied to the QCD correction ...